6 Suggested Answers

Hi,
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I checked the vacuum hose to see if there was a clog. 1st, disconnect the hose from the unit so you have access to both ends. Now, place a marble or other ball in one of the hose and see if it will make it all the way through. I found a major "hairball" about 8-10 in down from the vacuum end. I took a metal cloths hanger and bent it in half and did a "roto-rooter operation. It took about 30 minutes, but now it runs like new. I hope this works for you.

if the belt has been slipping it may have pollished the moteror brush shaft and it just slips. take a small piece of sand paper or enery cloth and ruffen up the shaft to give it some grip.
if the metal shaft of the motor has been heated up due to slippage it will take some doing to ruffun it as the shaft will be hardend due to heat

Just by what you explained I can tell that it needs to be replaced. The belt doesn't have to be broken to need replacing, if it is stretched and worn then it will slip on the motor shaft and not turn the brush roll and get hot. Here is a link to the belts you need and the manual which has instructions:

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1st) make sure your yellow dial at the top by handle is in floor position2nd) make sure your brush roll spins when handle is reclined in operating position. (disengage brushroll control by flipping the "switch" towards you) 3rd) check belt to make sure it is not broken4th) check the brush roll for debris caught in it5th) check lower hose

I know the belt number
Eureka Part Number: 61110B (Replaces 61110, 61110A)And the roller i think: Genuine Eureka Brush roller part number 61250-3 for Eureka The Boss/Smart vac/smartvac ultra 4800 series vacuums including models 4870 and 4880Hope this helps you.

Just by what you explained I can tell that it needs to be replaced. The belt doesn't have to be broken to need replacing, if it is stretched and worn then it will slip on the motor shaft and not turn the brush roll and get hot. Here is a link to the belts you need and the manual which has instructions:

You either have the wrong size belt, most likely too small, or you have installed a new belt incorrectly. When you open the cover on the bottom of your vac, you will see the pulley that moves as you flip the switch from floors to carpet. The belt does not go around this pulley. When activated(carpet) the pulley puts tension on the belt causing it to turn the roller. When switched back to hard floors, the belt looses tension allowing motor to cause suction but disabling roller. Also, the dial on top of vac is only to direct suction, not for disabling roller

HI
Don't forget that you have a height adjustment control so its better to put it in the highest position - if this is not allowing the roller brush to move properly on the carpet then switch the vacuum off, and lightly trim with scissors on the brush lines. Avoid cutting everything down though - a slight trim should improve things. Generally though when brushes appear too long its usually because the height adjustment dial hasn't been set upwards.

You need a new belt. Belts will stretch to the point that they won't turn the brush roll under load, they will just slip. Check the brush when you change the belt to make sure the ends turn easily, if not, then replace it also.